This is probably old news, so forgive me if it is, but Checkers carries Sierra
brand coolant for about 7.50 USD a gallon with a $2 mail in rebate.

I've read a few online reports about prop vs ethyl, and it's quite interesting.
 Prop won't carry quite as much heat energy but it's a pretty small difference,
the BIG difference is pumpability at low temps, with prop being about 6 times
as hard to pump at 20 below.

Here's the pumpability chart in text form , E.G. is ethylene glycol-

 0� F   3 x E.G.
-20� F  6 x E.G.
-40� F  9 x E.G.

Of course, your coolant won't be that cool very long, but I wonder about
getting things moving in a vanagon with the long cooling lines on a -30F day in
Minnesota.  And prop vs ethyl freezing characteristics are very different, too.

tom

------
Tom Ring K0TAR, ex-WA2PHW  EN34hx
85 Westphalia GL Albert
96 Jetta GL The Intimidator
taring@taring.org

"It is better to go into a turn slow, and come out fast, than to go into a turn
fast
and come out dead." Stirling Moss